Newton's Second Law (Translational Dynamics)

AP Physics 1· difficulty 3/5

A box sits on a flat-bed truck. The truck accelerates at 2.0 m/s22.0~\text{m/s}^2. What is the minimum coefficient of static friction needed to prevent the box from sliding? (g10 m/s2g \approx 10~\text{m/s}^2.)

  • A

    0.200.20

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  • B

    0.800.80

  • C

    0.400.40

  • D

    0.100.10

Explanation

Static friction must supply f=maf = m a. Maximum is μsmg\mu_s m g, so μsa/g=2/10=0.20\mu_s \geq a/g = 2/10 = 0.20.

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